With Goldman Sachs employees on track for their best bonus year ever, the investment bank's executives have been making the case that their bounty is good for all of us. "We contribute to growth," CEO Lloyd Blankfein said at a breakfast put on by FORTUNE. "Once the economy starts to turn, we get very involved." In a discussion about morality and markets at St. Paul's Cathedral in London, Goldman Sachs International vice chairman Brian Griffiths, a former adviser to Margaret Thatcher, described giant paychecks for bankers as an economic necessity. "We have to tolerate the inequality as a way...